Seminar & Colloquium
[세미나: 11월 25일(금), 오후 3시] 고려대학교 공과대학 첨단소재부품개발연구소, 전상호 연구교수
Title
Crystal nucleation and metastable solidification in supercooled metallic liquids
Speaker
고려대학교 공과대학 첨단소재부품개발연구소, 전상호 연구교수
EDUCATION
- 2016.02 Ph.D. University of Science and Technology (UST), Daejeon, South Korea
Advisor: Dr. Geun Woo Lee
Dissertation: Thermophysical properties and nucleation studies in supercooled metallic liquids using electrostatic levitation
- 2009.02 M.S. Hannam University, Daejeon, South Korea
Advisor: Dr. Jae Heung Jo
Co-Advisor: Dr. Seung-Nam Park
Thesis: Study of infrared spectral emissivity measurement of materials
- 2007.02 B.S. Hannam University, Daejeon, South Korea
PROFESSIONAL EXPERIENCE
- 2023.01 – P21.2 Beamline scientist (appointment scheduled), PETRA III, DESY, Germany
- 2022.08 – current Research professor, Institute for High Technology Materials and Device, Korea University, South Korea
- 2021.02 – 2021.12 Postdoctoral Scholar (Supervisor: Geun Woo Lee), Korea Research Institute of Standards and Science (KRISS), South Korea
- 2020.10 – 2020.11 Visiting Scholar (Supervisor: Douglas M. Matson), Department of Mechanical Engineering, Tufts University, USA
- 2017.02 – 2020.09 Postdoctoral Scholar (Supervisor: Douglas M. Matson), Department of Mechanical Engineering, Tufts University, USA
- 2016.02 – 2016.11 Research assistant, UNIST Synchrotron Radiation Center (6D UNIST-PAL Beamline) of Pohang Accelerator Laboratory (PAL), South Korea
- 2009.03 – 2010.02 Intern researcher, Korea Research Institute of Standards and Science (KRISS), South Korea
| Date | Friday, November 25th, 2022
| Time | 15:00 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
Crystal nucleation and solidification are the key procedures controlling the processing of most metals and alloys in use today. The process often occurs under non-equilibrium conditions, then the crystal nucleation and growth may involve unique physical phenomena, such as multi-step phase transformation and drastic morphological change, resulting in multiphase patterns with diverse morphologies. Hence, understanding and controlling the kinetic pathways involving metastable states during solidification offer the key to explore potential materials with morphologies and functionalities which do not present in equilibrium states. However, the study is often limited due to difficulties on controlling experimental conditions and lack of comprehensive insight into crystal nucleation and solidification behavior under non-equilibrium states. In this talk, I introduce containerless levitation and in-situ high energy synchrotron X-ray diffraction techniques to overcome the measurement limitations. In a non-contact environment such as electrostatic levitation and electromagnetic levitation conditions, molten metals often are deeply undercooled, and the degree of undercooling is related with the atomic local structure, that is, how in liquids atoms interact with each other and the interaction varies with temperature and composition. The deep undercooling of liquid metals often involves non-equilibrium solidification and affects significantly crystal defects on the microstructure. Thus, this talk will focus on the fundamental issues associated with undercooling, nucleation, and solidification of liquid metals.
| Host | 박은수 교수 (880-1713)